Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2006-10-03
2006-10-03
Phan, Hanh (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S182000, C398S186000, C398S189000, C398S190000, C398S191000, C398S202000, C398S214000, C398S141000, C332S109000, C332S107000, C327S172000, C327S175000, C327S176000, C375S238000, C331S045000, C331S049000, C331S017000
Reexamination Certificate
active
07116916
ABSTRACT:
A pulse width of a pulse having a nominal pulse width is modulated in accordance with a digital value to be communicated. The number of clock cycles that the modulated pulse width exceeds the nominal pulse width is counted. Various embodiments use a counter to determine the extent that the modulated pulse exceeds the nominal pulse width. The counter is initialized to a value (P) upon detection of a first edge of the extended pulse. The counter is configured to rollover or is reset when the counter reaches a count of P+M, where M represents the nominal pulse width count. In various embodiments, P is zero. The counter is halted upon detection of a second edge of the extended pulse. The resulting count represents the digital data value.
REFERENCES:
patent: 4713841 (1987-12-01), Porter et al.
patent: 5138118 (1992-08-01), Russell
patent: 5448629 (1995-09-01), Bosch et al.
patent: 5994973 (1999-11-01), Toki
Cochran Robert A.
Oseto David E.
Hewlett--Packard Development Company, L.P.
Phan Hanh
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